Lifting-jack



i portions and the y UNITED STATES PATENT OFFICE.

`:aminorar D. mim; OE DOVER, NEW JEEsEY, `Assis/Noa To MCKIEENAN-TERRY DRILL COMPANY, or NEW Yonx, N. Y., A CORPORATION OE NEW JERSEY.

. LIF TING- JACK.

T o all w hom it may concern:

y `Be it known that I, MALCOLM D. BIKER, a citizen of the United States of America, and a `resident of Dover, county of Morris, and State of New Jersey, have invented certain new and useful Improvements in Lifting-Jacks, of which the following is a specification, reference being had to the aecompanying drawing, formmg a part thereof.

The present invention relates particularly to lifting jacks of the screw type and the objects of the invention are to provide a light, powerful, easily assembled and relatively inexpensive device of this character.

Briefly, the invention comprises a tubular post member mounted Ona base and supporting a nut, a sleeve `slidingly engaged over said post and operated by a screw engaged with the nut, said tubular post and sleeve members being constructed preferably of commercial cylindrical tubing having indented or flattened slidably engaging side post member having the lower indented end thereof welded in a sub stantially Cylindrical seat provided in the base member.

Onefeaturc of my invention consists in flattening or indenting the post member for its full length and in providing the nut, which is seated in the upper end of said post. member, with laterally outstanding portions projecting beyond the indented sides of the post so as to slidably engage and guide the Cylindrical portion' of the surrounding sleeve member.

Another feature of the `invention is a step having a base portion fitted to both the cyl lindrical and flattened lower end portion of the sleeve and preferably secured by being welded to said sleeve. M

Other features will appearas the specification proceeds.

In the accompanying drawings I have illustrated the invention embodied in one `of its practical `and preferred forms, but would have it understood that modifications may be made in theconstruction without departure from the true spirit and scope of the in- `vention.

In said drawing:` ILigure 1 is a vertical sectional view of the ac l Fig. 2 is a similar view, taken on a. plane `at right angles to the plane of` Fig. 1.

Figs, 3, 4 and 5 are cross sectional views,

Specification of Letters Patent. Pateted Sgpt, 13, `1921 Application med oetober 23, 1919. serial No. 332,709.

taken substantially on the planes of lines i 3 3, 4--4 and 5-5 of Figsl and 2.

7 designates the base of the jack which may be of cast or forged metal and which 1s shown in the present disclosure as provided with a substantially circular seat-8 in the upper face thereof.

9 designates a tubular postmemher preferably formed of commercial tubing initially of cylindrical shape and having the opposite side portions thereof indented or flattened` as indicated at 1() for substantially the fullheight of the post. This post is secured in the base `by engaging it in the cylindrical seat and then fastening it as by welding, as indicated at 11. In making this weld the welding metal is flowed into the spaces left between the flattened sides of the tubing and the surrounding wall of the circular seat, as indicated at 12to provide keys between the post and the base securing said parts together and positively holding them against `relative rotation.

The outer sleeve 13 is also preferably formed of commercial cylindrical tubing of` a size to slidingly fit over the post tubing and this sleeve is formed with corresponding indentations or flattened portions 14 at the lower end thereof to slidingly fit over the indented or flattened portions of the post, said construction preventing relative rotation between the post and sleeve.

The sleeve carries a suitable lifting head 15 for engaging the object to be lifted.

Mounted in the upper end of the tubular post is the nut block 16, said nut block being of novel construction in that it is shaped at its lower endto fit within the indented post member and is provided at its upper end with laterally outstanding portions 17, projecting beyond the indented side portionsv of the post and'completing the rounded contour of the post so as to form a guide for the outer sleeve member. l

The sleeve is operatedby a screw 18, which is preferably of tubularconstruotion, as indicated, said screw engaging `the nut and provided, in this lparticular disclosure with a worm gear 19 engaged by a driving worm 20 'ournaled in the head portion of the jack.

he connection between the screw, the

worm gear and the lifting head is of novel Construction, involving a form of unitary joint between the screw, the gear and a plug memberwhich connects with the head.'

This feature is clearly disclosed in Figs. 1 and 2, and consists in seating the. plug 2l in the upper end of the screw and in seating the worm gearv over the upper end portion of the screw, said plug and worm gear having annular recesses 22, 23 formed ink their adjacent peripheral portions to provide a gutterinto vwhich the upper reduced end portion 24 of the screw projects. After assemblage in this fashion the parts are secured together by flowing a welding metal in this gutter, 1 substantially as indicated. This provides an integral tie between the screw, the plug and the gear and constitutes a permanentjjointV which is both simple and can be easily made. The plug has a seat in the lifting head, as indicated at 25 and a thrust bearing or washer 26 may be interposed between the upper face of the gear andv theunder face ofthe lifting head.

The jack is usually provided with a step, such as indicated at 27, for engagement beneath lovv objects. The step shown is of VV'novel construction in that it is provided with a base portion or flange-wall 28 of partly cylindrical conformation to t the cylindrical portion of the outer sleeve member and with rearwardlyV projecting angular extensions or lugs 29 engaging the flattened sides of the sleeve. This step may be secured to the sleeve member by welding and the flange-wall construction disclosed provides a very firm connection for said step, said Vflange-wall serving to brace the step and facilitate thesecuringof the step in place by positioning the step on the sleeve in the course of the welding operation,

The front partly cylindrical portion of the flange-wall may be extended vertically an appreciabledistance, as indicated and this,

in connection with the rearwardly extending portion elfeetually braces the step in the direction' of stress.y

A The present,V construction provides a jack which isV exceedingly powerful and which fat the same time is relatively light in weight.

The main parts are constructed of standard Vcommercial tubing, which needs only to be flattened or indented in the manner disclosed. The device is readily assembled and the parts which are to be permanently secured are of'such construction that they can be readily fastened by welding.

Proper lubrication of the screw is effected in my invention by providing an oil duct 3() l extending down through the head of the Vjack,` through the plug and through the w wall of thehollow screw to the interior of inforc'ed'by'a lining 31 disposed within the tubular post about the screw, and arranged to form a supplementary support for the nut block. This lining is shown as a section of cylindrical tubing of substantially the diameter of the flattened or indented portion of the post and disposed within the post resting upon the base at its lower end and providing at its upper end a bearing for the lower portion of the nut block.

lVhat I claim is:

l. A lifting jack comprising a base having a substantially circular seat, a tubular post having a substantially cylindrical lower end with indented sides engaged in said seat andv welded to said base with welding metal flowed into the spaces between the flattened sides of the post and the surrounding walls of the circular seat. a nut block supported in the upper end of the post, a sleeve slidvably engaged over the post and a screw engaged with the nut block and connected with the sleeve aforesaid.

2. In a lifting jack, a base having a substantially circular' seat, a tubular post member having indented side portions extending the full length of the same, said post being engaged at its lower end in the seat in the base and connected thereto by a welded joint including a filling of welding metal between the indented sides of the post and the surrounding walls of the seat, a nut block hav- 'ing a base portion seated in the upper end of the upper end of'the post and a laterally outstanding portion projecting beyond the indented side portions of the post, a sleeve slidably fitting over said outstanding portion'of the nut and provided with indented side portions fitting the indented side portions of the post, a screw engaged in the nut and connected with the sleeve and means l' or rotating said screw.

a. In a lifting jack a base provided with a substantially circular seat, a post consist-ing of a section of commercial tubing having indentations in the sides thereof extending the full length of said section, said post being engaged at its lower end in the seat in the base and connected with said base by a welded joint including welding metal filled into the spaces between the indented side llO the same, said sleeves having indented side portions at the lower end thereof slidingly tting the indented side portions of the tubular post, a nut havin a base portion seated 1n the upper end 0I the tubular post and a laterally 'outstanding portion pro'ecting beyond the indented side portions o the post and slidingly engaged by the surround- 1ng sleeve, a screw engaged in said nut and connected with the sleeve and means for rotatin said nut.

5. n a lifting jack, the combination of a nut, a tubular screw engaged with said nut, a plug set in the upper end of said tubular screw, a gear engaged over thc upper end of the screw, said gear and plug having recessed portions providing an annular gutter at the upper end of the screw and into which gutter said upper end of the screw projects and welding metal filled in said gutter and integrally uniting the screw with the plug and gear respectivel 6. In a liftin jac Z the combination with a post and a su stantially cylindrical sleeve slidably engaged over the same and provided with indented side portions, of a step, means securing the ste to the sleeve comprising lugs straddlin t e indented portions of the sleeve, and a ange extending from the step in engagement with the sleeve between the indente portions.

7 In a lifting jack, the combination with a sleeve and a step, of a pair of spaced lugs extending from the step, a flange-wall on the step between the roots of the lugs extending perpendicularl to the lugs and step, flat walls on the s eeve in engagement with the adjacent sides of the lugs, and an arcuate surface on the sleeve between the flat walls in engagement with the flange-wall on the flange-wall extendinv from the base and in contact with the cyllndrical surface of the sleeve.

9. In a lifting jack, a base, a tubular post mounted on the base, a nut seated in the upper end, of Said post, a sleeve within said post supported on the base at its lower end and engaging the lower end of the nut at its upper end, a sleeve slidably engaged over the post, a screw engaged with the nut and connected with said slidable sleeve, said screw extending down within the sleeveinside the post and provided with means for rotating the same.

10. In a lifting jack, a base, a tubular post mounted on said base and provided with indented side portions, a nut seated in the upper end of said post, a substantially c lindrical sleeve'within the post substantially the diameter of said indented side portions of the post, said sleeve having a bearing on the base at its lower end and supporting the nut at its upper end, a screw engaged in the nut and extending down inside said sleeve, a sleeve slidably engaged over the tubular post and connected with the screw, and means for rotating said screw. j

11. In a lifting jack, the combination of a tubular post, a nut supported thereby, a hollow screw engaging said nut, a plug seated in the upper end of said screw, a lifting head supported by said screw, said lifting head, plug and screw having an oil duct for supplying a lubricant directly to the engaging threads of the screw and nut, and means for turning the screw.

12. In a lifting jack, a tubular post, a nut supported thereby, a screw engaged in said nut and provided with a closed upper end, said closed upper end portion of the screw having an oil cavity therein and a duct eX- tending out from said cavity to the threaded portion of said screw, and a lifting head supported by the screw, said lifting head having an opening into said oil cavity in the upper end of the Screw.

In witness whereof, I hereunto set my hand this 21st dav of October, 1919.

. MALCOLM D. BIKER. 

